How is factor of safety expressed? - Basic Mechanical Engineering

Q.  Factor of safety is the ratio of _________
- Published on 01 Sep 15

a. working stress and ultimate strength
b. yield strength and endurance strength
c. ultimate strength and yield strength
d. yield strength and working stress

ANSWER: yield strength and working stress

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    Discussion

  • Sravanthi   -Posted on 06 Nov 15
    - Factor of safety for different materials is different.

    - The ratio of material strength to working stress is called as factor of safety.

    - Factor of safety for static loading of ductile materials is defined as the ratio of yield strength and allowable stress.

    - Factor of safety for static loading of brittle loads is defined as the ratio of ultimate strength and allowable stress.

    - The maximum stress that a material can withstand when it is stretched or pulled before failing or breaking is called as ultimate strength.

    - Allowable stress is called as design stress or working stress. The permissible maximum stress subjected to a material, which is large enough to prevent failures is called as allowable stress or design stress.

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